title: Bis(2,2'-bipyridyl-κ(2) N,N')(sulfato-κ(2) O,O')nickel(II) 2.5-hydrate.
abstract: The title compound, [Ni(SO4)(C10H8N2)2]·2.5H2O, is a nickel(II) complex with a distorted octa-hedral coordination geometry. The Ni(II) atom is bonded by two O atoms of the bidentate chelating sulfate ligand and the four N atoms of two chelating 2,2'-bi-pyridine ligands. The Ni-N bond lengths range from 2.059 (3) to 2.075 (3) Å and the Ni-O bond lengths are 2.098 (3) and 2.123 (3) Å. The bipyridyl ligands are both close to planar (r.m.s. deviations of 0.254 and 0.0572 Å) and are almost orthogonal, making a dihedral angle of 82.77 (1)°. In the crystal, the complex and water mol-ecules are connected by O-H⋯O hydrogen bonds. Inter-estingly, six water mol-ecules form a chain linking two complex mol-ecules via sulfate O atoms. There are also stacking inter-actions between the aromatic rings of neighbouring 2,2'-bi-pyridine ligands with shortest non-covalent contacts of 3.268 (6), 3.393 (6) and 3.435 (5) Å. One of the three unique water molecules shows half-occupation.
authors.affiliation: Department of Chemistry, National Taras Shevchenko University, Volodymyrska Str. 64, 01601 Kiev, Ukraine.
authors.forename: Turganbay
authors.initials: T
authors.lastname: Iskenderov